Ottawa County, Ohio — public water systems
At a glance
36 active public water systems are filed under Ottawa County, Ohio in EPA's SDWIS records, together reporting 47,393 people served. The largest is Ottawa County Regional Water District, which reports serving 20,428 people. 11 are community water systems serving people where they live; the other 25 are non-community systems, such as schools, workplaces, campgrounds and gas stations with their own supply.
Dataset updated . Source: EPA SDWIS/ECHO, refreshed quarterly.
Active systems
36
Population served
47.4K
Community systems
11
Groundwater share
75%
How does Ottawa County compare with other Ohio counties?
Ottawa County has the 38th-most active public water systems among the 133 counties listed for active Ohio systems in EPA records; among the 92 with 3 or more systems, the median has 29. Its systems report 47,393 people served in total, the 44th-largest county figure in the state and 0.4% of the statewide total. The average system here reports serving 1,317 people, about half of the Ohio average of 2,767. Population figures are what each system reports; people served by more than one system, such as a wholesaler and the town that buys from it, are counted by each.
Where does Ottawa County's drinking water come from?
By primary water source, Ottawa County's active systems draw on groundwater (27, 75%), purchased surface water (5, 14%) and surface water (4, 11%). Overall, 75% rely mainly on groundwater (including purchased groundwater) and 25% on surface water, compared with 92% and 7.6% across Ohio. Groundwater means the system draws its water from wells or springs fed by underground aquifers. The county's largest system, Ottawa County Regional Water District, draws primarily on surface water.
What kinds of water systems operate in Ottawa County?
Ottawa County's active systems break down as 11 community systems (31%), 2 non-transient non-community systems (5.6%) and 23 transient non-community systems (64%). A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. A transient non-community water system serves places where people do not stay long, such as gas stations and campgrounds, and regularly serves at least 25 people a day for at least 60 days a year. EPA lists their owner types as private (78%) and local government (22%).
Water systems in Ottawa County
🔒 Create a free account to export CSV| # | Water system | County | Population served | Type | Source |
|---|---|---|---|---|---|
| 1 | Ottawa County Regional Water District | Ottawa | 20,428 | Community | Surface water |
| 2 | Port Clinton City | Ottawa | 6,500 | Community | Purchased surface water |
| 3 | Put-in-Bay Village | Ottawa | 5,000 | Community | Surface water |
| 4 | Oak Harbor Village | Ottawa | 4,400 | Community | Purchased surface water |
| 5 | Genoa Village | Ottawa | 3,110 | Community | Purchased surface water |
| 6 | Carroll Water and Sewer | Ottawa | 2,288 | Community | Surface water |
| 7 | Elmore Village | Ottawa | 1,421 | Community | Purchased surface water |
| 8 | Marblehead Village | Ottawa | 865 | Community | Purchased surface water |
| 9 | Cedarlane Rv Park | Ottawa | 600 | Transient non-community | Groundwater |
| 10 | Lake Erie Utilities Company | Ottawa | 400 | Transient non-community | Surface water |
| 11 | St Hazards - Middle Bass Island | Ottawa | 300 | Transient non-community | Groundwater |
| 12 | J F Walleye | Ottawa | 207 | Transient non-community | Groundwater |
| 13 | Blackberry Corners | Ottawa | 150 | Transient non-community | Groundwater |
| 14 | Chippewa Golf Club | Ottawa | 150 | Transient non-community | Groundwater |
| 15 | Grand Country | Ottawa | 130 | Community | Groundwater |
| 16 | The Keg | Ottawa | 115 | Transient non-community | Groundwater |
| 17 | Catawba Shores M H Court | Ottawa | 102 | Transient non-community | Groundwater |
| 18 | Crazy Lady Saloon | Ottawa | 100 | Transient non-community | Groundwater |
| 19 | Bethel United Brethren Church - Elmore | Ottawa | 100 | Transient non-community | Groundwater |
| 20 | St Peters Lutheran Church/Preschool | Ottawa | 89 | Transient non-community | Groundwater |
| 21 | Green Valley Mobile Home Park | Ottawa | 82 | Community | Groundwater |
| 22 | Grace Lutheran Church Elmore | Ottawa | 81 | Transient non-community | Groundwater |
| 23 | Sugar Creek Golf Club | Ottawa | 78 | Transient non-community | Groundwater |
| 24 | Greenwood Mobile Home Park | Ottawa | 77 | Community | Groundwater |
| 25 | Shade Acres Campground and Rv Park | Ottawa | 75 | Transient non-community | Groundwater |
| 26 | Ernestos Restaurant | Ottawa | 71 | Transient non-community | Groundwater |
| 27 | St John Lutheran Church - Rocky Ridge | Ottawa | 60 | Transient non-community | Groundwater |
| 28 | North Point Education Service Ctr Ottawa | Ottawa | 60 | Non-transient non-community | Groundwater |
| 29 | Graymont Dolime (Oh) | Ottawa | 60 | Non-transient non-community | Groundwater |
| 30 | Kaisers Limestone Tavern | Ottawa | 54 | Transient non-community | Groundwater |
| 31 | The Mockingbird on Mill Road | Ottawa | 53 | Transient non-community | Groundwater |
| 32 | Hidden Hideaway Campground West-Rear | Ottawa | 50 | Transient non-community | Groundwater |
| 33 | Bench, Robert Amlc Pws | Ottawa | 42 | Transient non-community | Groundwater |
| 34 | Elliston Zion Umc- Graytown | Ottawa | 40 | Transient non-community | Groundwater |
| 35 | Hidden Hideaway Campground East-Front | Ottawa | 30 | Transient non-community | Groundwater |
| 36 | Bench-Dickinson Amlc Pws | Ottawa | 25 | Transient non-community | Groundwater |
Ottawa County water systems: frequently asked questions
How many public water systems are in Ottawa County, Ohio?
EPA's SDWIS records file 36 active public water systems under Ottawa County, Ohio: 11 community systems (31%), 2 non-transient non-community systems (5.6%) and 23 transient non-community systems (64%).
Who supplies drinking water in Ottawa County, OH?
The largest community water systems filed under Ottawa County are Ottawa County Regional Water District (20,428 people served), Port Clinton City (6,500 people served) and Put-in-Bay Village (5,000 people served). Which system serves a particular address depends on its service area, which EPA's SDWIS records do not include; a water bill or the local utility can confirm it.
Does Ottawa County's drinking water come from groundwater or surface water?
Of the 36 active public water systems in Ottawa County, 75% draw mainly on groundwater and 25% on surface water, counting purchased supplies. The largest system, Ottawa County Regional Water District, uses surface water.
Where can I find a water quality report for Ottawa County?
Each community water system must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1, covering the previous calendar year. 11 community systems are filed under Ottawa County, so the report to look for is the one from the system that supplies your address.
How can I check violations for a water system in Ottawa County?
Open the system's profile from the list on this page. Each profile shows the most recent Safe Drinking Water Act violations in EPA's records, with plain-English labels and whether each one is resolved. For current compliance status, EPA ECHO is the primary source.
More Ohio water systems
About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “Public water systems in Ottawa County, Ohio”, https://aquacensus.com/water-systems/ohio/ottawa (data as of October 1, 2026).